http 0.12.0+2

A composable, Future-based library for making HTTP requests.

pub package Build Status

This package contains a set of high-level functions and classes that make it easy to consume HTTP resources. It's platform-independent, and can be used on both the command-line and the browser.

Using #

The easiest way to use this library is via the top-level functions. They allow you to make individual HTTP requests with minimal hassle:

import 'package:http/http.dart' as http;

var url = '';
var response = await, body: {'name': 'doodle', 'color': 'blue'});
print('Response status: ${response.statusCode}');
print('Response body: ${response.body}');


If you're making multiple requests to the same server, you can keep open a persistent connection by using a Client rather than making one-off requests. If you do this, make sure to close the client when you're done:

var client = new http.Client();
try {
  var uriResponse = await'',
      body: {'name': 'doodle', 'color': 'blue'});
  print(await client.get(uriResponse.bodyFields['uri']));
} finally {

You can also exert more fine-grained control over your requests and responses by creating Request or StreamedRequest objects yourself and passing them to Client.send.

This package is designed to be composable. This makes it easy for external libraries to work with one another to add behavior to it. Libraries wishing to add behavior should create a subclass of BaseClient that wraps another Client and adds the desired behavior:

class UserAgentClient extends http.BaseClient {
  final String userAgent;
  final http.Client _inner;

  UserAgentClient(this.userAgent, this._inner);

  Future<StreamedResponse> send(BaseRequest request) {
    request.headers['user-agent'] = userAgent;
    return _inner.send(request);

0.12.0+2 #

  • Documentation fixes.

0.12.0 #

New Features #

  • The regular Client factory constructor is now usable anywhere that dart:io or dart:html are available, and will give you an IoClient or BrowserClient respectively.
  • The package:http/http.dart import is now safe to use on the web (or anywhere that either dart:io or dart:html are available).

Breaking Changes #

  • In order to use or reference the IoClient directly, you will need to import the new package:http/io_client.dart import. This is typically only necessary if you are passing a custom HttpClient instance to the constructor, in which case you are already giving up support for web.

0.11.3+17 #

  • Use new Dart 2 constant names. This branch is only for allowing existing code to keep running under Dart 2.

0.11.3+16 #

  • Stop depending on the stack_trace package.

0.11.3+15 #

  • Declare support for async 2.0.0.

0.11.3+14 #

  • Remove single quote ("'" - ASCII 39) from boundary characters. Causes issues with Google Cloud Storage.

0.11.3+13 #

  • remove boundary characters that package:http_parser cannot parse.

0.11.3+12 #

  • Don't quote the boundary header for MultipartRequest. This is more compatible with server quirks.

0.11.3+11 #

  • Fix the SDK constraint to only include SDK versions that support importing dart:io everywhere.

0.11.3+10 #

  • Stop using dart:mirrors.

0.11.3+9 #

  • Remove an extra newline in multipart chunks.

0.11.3+8 #

  • Properly specify Content-Transfer-Encoding for multipart chunks.

0.11.3+7 #

  • Declare compatibility with http_parser 3.0.0.

0.11.3+6 #

  • Fix one more strong mode warning in http/testing.dart.

0.11.3+5 #

  • Fix some lingering strong mode warnings.

0.11.3+4 #

  • Fix all strong mode warnings.

0.11.3+3 #

  • Support http_parser 2.0.0.

0.11.3+2 #

  • Require Dart SDK >= 1.9.0

  • Eliminate many uses of Chain.track from the stack_trace package.

0.11.3+1 #

  • Support http_parser 1.0.0.

0.11.3 #

  • Add a Client.patch shortcut method and a matching top-level patch method.

0.11.2 #

  • Add a BrowserClient.withCredentials property.

0.11.1+3 #

  • Properly namespace an internal library name.

0.11.1+2 #

  • Widen the version constraint on unittest.

0.11.1+1 #

  • Widen the version constraint for stack_trace.

0.11.1 #

  • Expose the IOClient class which wraps a dart:io HttpClient.

0.11.0+1 #

  • Fix a bug in handling errors in decoding XMLHttpRequest responses for BrowserClient.

0.11.0 #

  • The package no longer depends on dart:io. The BrowserClient class in package:http/browser_client.dart can now be used to make requests on the browser.

  • Change MultipartFile.contentType from dart:io's ContentType type to http_parser's MediaType type.

  • Exceptions are now of type ClientException rather than dart:io's HttpException.

0.10.0 #

  • Make BaseRequest.contentLength and BaseResponse.contentLength use null to indicate an unknown content length rather than -1.

  • The contentLength parameter to new BaseResponse is now named rather than positional.

  • Make request headers case-insensitive.

  • Make MultipartRequest more closely adhere to browsers' encoding conventions.


import 'dart:convert' as convert;
import 'package:http/http.dart' as http;

main(List<String> arguments) async {
  // This example uses the Google Books API to search for books about http.
  var url = "{http}";

  // Await the http get response, then decode the json-formatted responce.
  var response = await http.get(url);
  if (response.statusCode == 200) {
    var jsonResponse = convert.jsonDecode(response.body);
    var itemCount = jsonResponse['totalItems'];
    print("Number of books about http: $itemCount.");
  } else {
    print("Request failed with status: ${response.statusCode}.");

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  http: ^0.12.0+2

2. Install it

You can install packages from the command line:

with pub:

$ pub get

with Flutter:

$ flutter pub get

Alternatively, your editor might support pub get or flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:http/http.dart';
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Learn more about scoring.

We analyzed this package on Sep 20, 2019, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.5.0
  • pana: 0.12.21


Detected platforms: Flutter, web, other

No platform restriction found in primary library package:http/http.dart.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.0.0-dev.61.0 <3.0.0
async >=1.10.0 <3.0.0 2.3.0
http_parser >=0.0.1 <4.0.0 3.1.3
path >=0.9.0 <2.0.0 1.6.4
pedantic ^1.0.0 1.8.0+1
Transitive dependencies
charcode 1.1.2
collection 1.14.12
meta 1.1.7
source_span 1.5.5
string_scanner 1.0.5
term_glyph 1.1.0
typed_data 1.1.6
Dev dependencies
test ^1.3.0